Hit and miss
The game is fun in general, but you missed big time on a few things. First, distorting the tank and changing the graphic is a bad idea in a search game. Second, having low resolution and searching for an icon that is low resolution as well is a bad idea. Third, Distorting a low resolution icon in a low resolution pic is a horrible idea. This game feels like "random click adventure" at times, especially when you make the tank blend in after being so distorted. At one point there really isnt any tank image, its simply just 4-5 pixels screwed up and you're luck to even find them.
Use high quality pictures. Do not distort the icon or item to search. Do not make it impossible to see the icon by blending it completely in. There is no skill in finding the object if you can't already see it.